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DayStar Filters Interference Eliminator (T mount)
DayStar Filters Interference Eliminator (T mount)
DayStar Filters Interference Eliminator (T mount)
DayStar Filters Interference Eliminator (T mount)

DayStar Filters Interference Eliminator (T mount)

Vendor
Daystar
Sale price
$199.00
Regular price
$225.00 You save 12%
Unit price
per 
Shipping calculated at checkout.

Availability:

Estimated Arrival: Between Nov 29 and Dec 05. *ETA to USA Only

Shipping & Returns: Satisfaction guaranteed 30 day return policy.

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Daystar Instruments products currently have a 3 week lead time. Thank you for your patience, it will be worth the wait!

Photographers imaging in monochromatic light, such as Hydrogen-Alpha, using an electronic sensor frequently encounter a wavy pattern of light and dark lines superimposed over their images. These lines are called interference fringes, interference patterns, or Newton's Rings. In long focal ratio applications, the nearly parallel light can internally reflect inside the image sensor or camera, causing an addition or subtraction of the light waves, resulting in the observed pattern.

The Interference Eliminator solves this problem by tilting the camera off normal while keeping the center of the image sensor stationary, so that focus, framing, and vignetting are not changed with the tilt. The tilt changes the angle of incidence and optical path lengths inside the image sensor, mitigating the interference.

Left: normal, problematic image. Right: With Interference Eliminator.
Telescope/filter: DayStar SolaREDi, tuned off band. Camera: Canon EOS 5D.

INSTALLATION & USE

Installation: The Interference Eliminator should be placed directly in front of the camera in the optical train. For proper operation, the distance from the flange of the male T thread to the camera focal plane should be 55mm. On a DSLR with a T ring, no spacers are required, the T ring sets the distance to 55mm. On a CCD camera or Webcam, male to female T ring spacers may be required to bring the distance to 55mm. If the distance is significantly different from 55mm, the camera will move off boresight and the focus position will shift while adjusting the Interference Eliminator tilt setting.

Use: Slightly loosen the thumbscrews and slide the two halves of the Interference Eliminator apart, such that the camera tilts. Take a few images with the camera to check for the interference pattern. Slide further apart if the pattern is still evident. Tilt it the minimum amount to eliminate fringes - too far and focus could be lost at the top and bottom of the image, especially in fast focal ratio systems. If the maximum tilt is reached without satisfactory effect, try full tilt in the opposite direction. In some severe instances, the interference pattern may not be completely removable, but it will be reduced to where other techniques such as flat fielding or compositing can make the image acceptable.

Notes: On large sensors such as full-frame 36x24mm DSLR cameras, some vignetting is possible at full tilt due to the camera structure and the inside diameter of the T thread. For an example of a full-frame Canon EOS 5D image at full tilt, click here. With webcams or 1.5-1.6x crop digital SLRs no vignetting will occur.

Specs

Camera compatibility

Digital cameras such as Canon, Nikon, and or DSLR cameras; Lumenera, Imaging Source, Philips, SBIG, and many more CCD cameras.

Telescope/filter compatibility

Recommended for long focal ratios (F/30( such as DayStar Filters

Thread

Male/Female 'T' thread, M42x0.75.

Dimensions

60x83mm ellipse, 22mm thick

Recommended distance to focal plane

55mm from male T flange. (Exact for Canon/Nikon DSLR cameras with standard T ring).

Range of motion

+/- 5 degrees

Weight

0.2 lb CNC machined aluminum

Maximum camera weight

7.7 lbs

Shipping

We know that once you've placed your order, you are anxious to receive it! We make every effort to get your order shipped out to you as quickly as possible.

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. We will process the charges to your credit card and your order will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out.  If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at info@telescopetek.com.

Standard shipping time in the US is between 3-5 business days, though it can vary slightly depending on the destination. We typically For updates on your shipment you can enter your tracking number here.

We distribute nationwide via UPS and Fedex. Unfortunately, at this time we are not able to provide expedited or international shipping.


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